free, or otherwise,
devils in the details,
book on keyword research be?
Or is that to broad a question?
Who in your opinion is the best teacher in this all important IM
To get better at keyword research
I just feel that I am not as "second skin" comfortable with my research as I should be.
I am particularly seeking the opinions of the most experienced adwords
people, because IMHO you have to be so dead on.